GOA driving circuit

ABSTRACT

The disclosure provides a GOA driving circuit comprising a plurality of GOA driving unit stages. When power is turned off, the pull-up control module controls the pull-up output module to stop outputting the clock signal, the pull-down control module controls the pull-down output module to stop outputting the low potential signal, the first global control module outputs the high potential signal, the reset module stops outputting the reset signal, and the second global control module stops outputting the low potential signal. Generation of the residual image on the liquid crystal screen is prevented when power is turned off.

RELATED APPLICATIONS

This application is a continuation application of PCT Patent ApplicationNo. PCT/CN2018/071663, filed Jan. 5, 2018, which claims the prioritybenefit of Chinese Patent Application No. 201711069576.3, filed Oct. 31,2017, which is herein incorporated by reference in its entirety.

FIELD OF THE DISCLOSURE

The disclosure relates to an electronic circuit field, and moreparticularly to a gate driver on array (GOA) driving circuit.

BACKGROUND

Thin film transistor liquid crystal display (TFT-LCD) has now become themainstream display on the market. The basic principle is that the liquidcrystal in the display is driven to deflect by the voltage and thedirection of light is changed so that different color is displayed inthe display. A Gate Driver On Array (GOA) circuit is a technology thatintegrates a gate driving circuit on an array substrate of a liquidcrystal display panel to scan the gate lines in sequence. In the case ofabnormal power off, the LCD screen remains residual image becausecharges are remained in the pixel capacitances. In the existedtechnologies, there is a lack of effective mechanisms to prevent thisphenomenon.

SUMMARY

The disclosure provides a gate driving circuit to prevent the LCD screenfrom remaining residual image when power is turned off abnormally, sothat enjoying watching is improved.

In a first aspect, the present disclosure provides a GOA drivingcircuit, comprising: a plurality of GOA driving unit stages; wherein, anth GOA driving unit stage comprises: a pull-up control module, apull-up output module, a pull-down control module, a pull-down outputmodule, a first global control module, a reset module and a secondglobal control module;

-   -   the pull-up control module is configured to generate a first        control signal when power is turned off;    -   the pull-up output module is configured to stop outputting a        clock signal to an output terminal of the nth GOA driving unit        stage under control of the first control signal;    -   the pull-down control module is configured to generate a second        control signal when power is turned off;    -   the pull-down output module is configured to stop outputting a        low potential signal to the output terminal of the nth GOA        driving unit stage under control of the second control signal;    -   the first global control module is configured to output a high        potential signal to the output terminal of the nth GOA driving        unit stage when power is turned off;    -   the reset module is configured to stop outputting a reset signal        to an output terminal of the pull-down control module when power        is turned off;    -   the second global control module is configured to stop        outputting output the low potential signal to the output        terminal of the nth GOA driving unit stage when power is turned        off.

In some possible embodiments combined with the first aspect, the pull-upcontrol module comprises a first thin film transistor (TFT), a secondTFT, a fifth TFT and a seventh TFT;

-   -   wherein, a gate terminal of the first TFT receives an output        signal of a (n−2)th GOA driving unit stage, a source terminal of        the first TFT receives a forward scan signal, and a drain        terminal of the first TFT is electrically connected to a source        terminal of the seventh TFT; a gate terminal of the second TFT        receives an output signal of a (n+2)th GOA driving unit stage, a        source terminal of the second TFT receives a reverse scan        signal, and a drain terminal of the second TFT is electrically        connected to the source terminal of the seventh TFT; a gate        terminal of the fifth TFT is electrically connected to the        output terminal of the pull-down control module, a source        terminal of the fifth TFT receives the low potential signal, and        a drain terminal of the fifth TFT is electrically connected to        the source terminal of the seventh TFT; a gate terminal of the        seventh TFT receives the high potential signal, and a drain        terminal of the seventh TFT is electrically connected to an        output terminal of the pull-up control module; wherein, the        pull-up control module is configured to generate the first        control signal, which is the low potential signal, to turn off        the pull-up output module when the power is turned off.

In some possible embodiments combined with the first aspect, the pull-upoutput module comprises: a tenth TFT;

-   -   wherein, a gate of the tenth TFT is electrically connected to        the output terminal of the pull-up control module, a source        terminal of the tenth TFT receives a nth stage clock signal, and        a drain terminal of the tenth TFT is electrically connected to        the output terminal of the nth GOA driving unit stage; wherein,        the pull-up output module is turned off by the low potential        signal generated from the pull-up control module when power is        turned off, so that the low potential signal is not output to        the output terminal of the nth GOA driving unit stage from the        pull-up output module.

In some possible embodiments combined with the first aspect, thepull-down control module comprises: a third TFT, a fourth TFT, a sixthTFT, an eighth TFT, a ninth TFT and a twelfth TFT;

wherein, a gate terminal and a source terminal of the third TFT receivea (n+1)th stage clock signal, and a drain terminal of the third TFT iselectrically connected to a source terminal of the eighth TFT; a sourceterminal and a gate terminal of the fourth TFT receives a (n−1)th stageclock signal, and a drain terminal of the fourth TFT is electricallyconnected to a source terminal of the ninth TFT; a gate terminal of thesixth TFT is electrically connected to the source terminal of theseventh TFT, a source terminal of the sixth TFT receives the lowpotential signal, and a drain terminal of the sixth TFT is electricallyconnected to the output terminal of the pull-down control module; a gateterminal of the eighth TFT receives the forward scan signal, and a drainterminal of the eighth TFT is electrically connected to the outputterminal of the pull-down control module; a gate terminal of the ninthTFT receives the reverse scan signal, and a drain terminal of the ninthTFT is electrically connected to the output terminal of the pull-downcontrol module; a gate terminal of the twelfth TFT receives a firstglobal control signal, a source terminal of the twelfth TFT receives thelow potential signal, and a drain terminal of the twelfth TFT iselectrically connected to the output terminal of the pull-down controlmodule; wherein, the pull-down control module is configured to generatethe second control signal, which is the low potential signal, to turnoff the pull-down output module when the power is turned off.

In some possible embodiments combined with the first aspect, thepull-down output module comprises: an eleventh TFT;

-   -   wherein, a gate terminal of the eleventh TFT is electrically        connected to the output terminal of the pull-down control        module, a source terminal of the eleventh TFT receives the low        potential signal, and a drain terminal of the eleventh TFT is        electrically connected to the output terminal of the nth GOA        driving unit stage; wherein, the pull-down output module is        turned off by the low potential signal generated from the        pull-down control module when power is turned off, so that the        low potential signal is not output to the output terminal of the        nth GOA driving unit stage from the pull-down output module.

In some possible embodiments combined with the first aspect, wherein thefirst global control module comprises: a fourteenth TFT;

-   -   wherein, a gate terminal and a source terminal of the fourteenth        TFT receive the first global control signal, and a drain        terminal of the fourteenth TFT is electrically connected to the        output terminal of the nth GOA driving unit stage; wherein, the        first global control module outputs the high potential signal to        the output terminal of the nth GOA driving unit stage when power        is turned off.

In some possible embodiments combined with the first aspect, the resetmodule comprises: a thirteenth TFT;

-   -   wherein, a gate terminal and a source terminal of the thirteenth        TFT receives the reset signal, and a drain terminal of the        thirteenth TFT is electrically connected to the output terminal        of the pull-down control module; wherein, the reset module is        configured to control to output the low potential signal from        the output terminal of the pull-down control module.

In some possible embodiments combined with the first aspect, the secondglobal control module comprises: a fifteenth TFT;

-   -   wherein, a gate terminal of the fifteenth TFT receives a second        global control signal, a source terminal of the fifteenth TFT        receives the low potential signal, and a drain terminal of the        fifteenth TFT is electrically connected to the output terminal        of the nth GOA driving unit stage; wherein, the second global        control module controls to output the high potential signal from        the output terminal of the nth GOA driving unit stage when power        is turned off.

In some possible embodiments combined with the first aspect, the nth GOAdriving unit stage further comprises a first capacitor and a secondcapacitor;

-   -   wherein, a first terminal of the first capacitor is electrically        connected to the source terminal of the seventh TFT, and a        second terminal of the first capacitor receives the low        potential signal; a first terminal of the second capacitor is        electrically connected to the output terminal of the pull-down        control module, and a second terminal of the second capacitor        receives the low potential signal; wherein, when power is turned        off, the first capacitor is configured to keep a potential at        the source terminal of the seventh TFT and the second capacitor        is configured to keep a potential at the output terminal of the        pull-down control module.

In some possible embodiments combined with the first aspect, in a firstGOA driving unit stage and a second GOA driving unit, the gate terminalof the first TFT receives a starting signal; and, in a last GOA drivingunit stage and a penultimate GOA driving unit stage, the gate terminalof the second TFT receives the starting signal; wherein the startingsignal is the high potential signal.

It can be found that each GOA driving unit stage of the GOA drivingcircuit in the embodiments of the present disclosure comprises a pull-upcontrol module, a pull-down control module, a pull-up output module, apull-down output module, a first global control module, a second globalcontrol module and a reset module. When power is turned off, the pull-upcontrol module generates the low potential signal to turn off thepull-up output module so that the output of the pull-up output moduledoes not affect the output terminal of the GOA driving unit; thepull-down control module and the reset module generate the low potentialsignal to turn off the pull-down output module so that the output of thepull-down output module does not affect the output terminal of the GOAdriving unit; the first global control module and the second globalcontrol module controls to output the high potential signal. Byperforming the embodiments of the present disclosure, image on theliquid crystal screen can be quickly cleaned when power of the liquidcrystal screen is suddenly turned-off, residual image is prevented frombeing remained on the screen, and visual experience is benefittherefrom.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to make the descriptions of the technique solutions of theembodiments of the present invention or the existed techniques, thedrawings necessary for describing the embodiments or the existedtechniques are briefly introduced below. Obviously, the drawingsdescribed below are only some embodiments of the present invention, and,for those with ordinary skill in this field, other drawings can beobtained from the drawings described below without creative efforts.

FIG. 1 is a function-module schematic diagram of the GOA driving unitaccording to the disclosure.

FIG. 2 is a circuit diagram of the GOA driving unit according to thedisclosure.

FIG. 3 is a timing diagram of the GOA driving circuit according to thedisclosure.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The technical solutions in the embodiments of the present disclosurewill be described clearly and completely hereinafter with reference tothe accompanying drawings in the embodiments of the present disclosure.Apparently, the described embodiments are merely some but not allembodiments of the present disclosure. All other embodiments obtained bypersons with ordinary skill in the art based on the embodiments of thepresent invention without creative efforts shall fall within theprotection scope of the present invention.

It is noted that, the terms used herein are only for illustratingconcrete embodiments rather than limiting the exemplary embodiments.Unless otherwise indicated in the content, singular forms “a” and “an”also include plural. Moreover, the term “and/or” means and includes anyor all possible combinations of one or more of the associated listeditems.

The terms “comprising” and “including”, as well as any variationsthereof in the description and claims of the present disclosure and theabove drawings, are intended to cover the inclusion of non-exclusiveinclusions. For example, comprising a process, method, system, product,or device that incorporates a series of steps or units is not limited tothe steps or units listed but may optionally further include steps orunits not listed or may optionally further include other steps or unitsinherent to these processes, methods, products, or devices.

It is noted that, the embodiments of the present disclosure aredescribed in detail below. Examples of the embodiments are shown in theaccompanying drawings, where the same or similar reference numbersindicate the same or similar elements or elements having the same orsimilar functions from beginning to end. The embodiments described belowwith reference to the accompanying drawings are exemplary only toexplain the present invention and should not be construed as limitingthe present invention.

The following disclosure provides many different embodiments or examplesfor implementing different structures of the present invention. In orderto simplify the disclosure of the present invention, the specificexamples of the components and arrangements are described below. Ofcourse, they are merely examples and are not intended to limit thepresent invention. In addition, the present disclosure may repeatreference numerals and/or letters in various examples. This repetitionis for the purpose of simplification and clarity and does not by itselfindicate the relationship between the various embodiments and/orarrangements discussed.

In the description of the present disclosure, it should be noted thatthe terms “mounted”, “connect with”, “connect to” and “connect” shouldbe broadly understood unless otherwise specified and limited. Forexample, they may be mechanical connections or electrical connections,or may be the intercommunication between the two components. Theintercommunication may be direct connection or indirect connectionthrough an intermediary medium. For those skilled in the art, thespecific meanings of the above terms may be understood according tospecific situations.

Reference herein to “embodiment” means that a particular feature,structure, or characteristic described in connection with the embodimentmay be included in at least one embodiment of the invention. Theappearances of the phrase in various places in the specification are notnecessarily all referring to the same embodiment, nor are separate oralternative embodiments mutually exclusive of other embodiments. Asobviously or inherently understood by one with ordinary skill in theart, the embodiments described herein may be combined with otherembodiments.

Please refer to FIG. 1, FIG. 1 is a function-module schematic diagram ofthe GOA driving unit according to the disclosure. As shown in FIG. 1,the GOA driving unit of the embodiment in the present disclosurecomprises the pull-up control module 101, the pull-up output module 102,the pull-down control module 103, the pull-down output module 104, thefirst global control module 105 the reset module 106 and the secondglobal control module 107.

In one embodiment, the pull-up control module 101 is electricallyconnected to the pull-down control module 103 and the pull-up outputmodule 102, the pull-up output module 102 is electrically connected tothe pull-down output module 104, the first global control module 105 andthe second global control module 107, the pull-down control module 103is electrically connected to the pull-down output module 104 and thereset module 106, the pull-down output module 104 is electricallyconnected to the first global control module 105 and the second globalcontrol module 107, and the first global control module 105 iselectrically connected to the second global control module.

The pull-up control module is configured to generate a first controlsignal when power is turned off; the pull-up output module is configuredto stop outputting a clock signal to an output terminal of the nth GOAdriving unit stage under control of the first control signal; thepull-down control module is configured to generate a second controlsignal when power is turned off; the pull-down output module isconfigured to stop outputting a low potential signal to the outputterminal of the nth GOA driving unit stage under control of the secondcontrol signal; the first global control module is configured to outputa high potential signal to the output terminal of the nth GOA drivingunit stage when power is turned off; the reset module is configured tostop outputting a reset signal to an output terminal of the pull-downcontrol module when power is turned off; and the second global controlmodule is configured to stop outputting the low potential signal to theoutput terminal of the nth GOA driving unit stage when power is turnedoff.

It can be found that each GOA driving unit stage of the GOA drivingcircuit in the embodiments of the present disclosure comprises a pull-upcontrol module, a pull-down control module, a pull-up output module, apull-down output module, a first global control module, a second globalcontrol module and a reset module. When power is turned off, the pull-upcontrol module generates the low potential signal to turn off thepull-up output module so that the output of the pull-up output moduledoes not affect the output terminal of the GOA driving unit; thepull-down control module and the reset module generate the low potentialsignal to turn off the pull-down output module so that the output of thepull-down output module does not affect the output terminal of the GOAdriving unit; the first global control module and the second globalcontrol module controls to output the high potential signal. Byperforming the embodiments of the present disclosure, image on theliquid crystal screen can be quickly cleaned when power of the liquidcrystal screen is suddenly turned-off, residual image is prevented frombeing remained on the screen, and visual experience is benefittherefrom.

Referring to FIG. 2, FIG. 2 is a circuit diagram of the GOA driving unitaccording to the second embodiment in the disclosure.

Each circuit module is described in detail as follows.

As shown in FIG. 2, the reference numeral 101 indicates the diagramshowing connections of the pull-up control module. The pull-up controlmodule 101 comprises the first thin film transistor (TFT) NT1, thesecond TFT NT2, the fifth TFT NT5 and the seventh TFT NT7.

In the embodiment, a gate terminal of the first TFT NT1 receives anoutput signal G(n−2) of a (n−2)th GOA driving unit stage, a sourceterminal of the first TFT NT1 receives a forward scan signal U2D, and adrain terminal of the first TFT NT1 is electrically connected to asource terminal of the seventh TFT NT7. A gate terminal of the secondTFT NT2 receives an output signal G(n+2) of a (n+2)th GOA driving unitstage, a source terminal of the second TFT NT2 receives a reverse scansignal D2U, and a drain terminal of the second TFT NT2 is electricallyconnected to the source terminal of the seventh TFT NT7. A gate terminalof the fifth TFT NT5 is electrically connected to the output terminal ofthe pull-down control module 103, a source terminal of the fifth TFT NT5receives the low potential signal VGL, and a drain terminal of the fifthTFT NT5 is electrically connected to the source terminal of the seventhTFT NT7. A gate terminal of the seventh TFT NT7 receives the highpotential signal VGH, and a drain terminal of the seventh TFT NT7 iselectrically connected to an output terminal of the pull-up controlmodule 101. Wherein, the pull-up control module is configured togenerate the first control signal, which is the low potential signal, toturn off the pull-up output module when the power is turned off.

Specifically, when power is turned off, the forward scan signal U2D isturned into the low potential signal and the output signal G(n−2) of the(n−2)th GOA driving unit is the high potential signal, so that the firstTFT NT1 is controlled to turn on and the drain terminal of the first TFTNT1 is at low potential thereby. The reverse scan signal D2U is turnedinto the low potential signal and the output signal G(n+2) of the(n+2)th GOA driving unit is the high potential signal, so that thesecond TFT NT2 is controlled to turn on and the drain terminal of thesecond TFT NT2 is at low potential thereby. Because the gate terminal ofthe fifth TFT NT5 is electrically connected to the output terminal ofthe pull-down control module 103 which is at low potential as describedbelow, the fifth TFT NT5 is turned off. The gate terminal of the seventhTFT NT7 receives the high potential signal and is turned on. Because thesource terminal of the seventh TFT NT7 receives the low potential signaltransmitted from the first TFT NT1 and the second TFT NT2, the drainterminal of the seventh TFT NT7 outputs the low potential signal so thatthe output of the pull-up control circuit is the low potential signal.

As shown in FIG. 2, the reference numeral 102 indicates the diagramshowing connections of the pull-up output module. The pull-up outputmodule 102 comprises the tenth TFT NT10.

In the embodiment, a gate of the tenth TFT NT10 is electricallyconnected to the output terminal of the pull-up control module 101, asource terminal of the tenth TFT NT10 receives a nth stage clock signalCK(n), and a drain terminal of the tenth TFT NT10 is electricallyconnected to the output terminal G(n) of the nth GOA driving unit stage.Wherein, the pull-up output module is turned off by the low potentialsignal generated from the pull-up control module when power is turnedoff, so that the low potential signal is not output to the outputterminal of the nth GOA driving unit stage from the pull-up outputmodule.

Specifically, when power is turned off, the nth stage clock signal CK(n)is turned into the low potential signal. Because the gate terminal ofthe tenth TFT NT10 is electrically connected to the output terminal ofthe pull-up control module 101 and the pull-up control module 101outputs the low potential signal, the tenth TFT NT10 is turned off sothat the low potential signal is not output to the output terminal G(n)of the nth GOA driving unit stage from the drain terminal of the tenthTFT NT10

As shown in FIG. 2, the reference numeral 103 indicates the diagramshowing connections of the pull-down control module. The pull-downcontrol module 103 comprises the third TFT NT3, the fourth TFT NT4, thesixth TFT NT6, the eighth TFT NT8, the ninth TFT NT9 and the twelfth TFTNT12.

In the embodiment, a gate terminal and a source terminal of the thirdTFT NT3 receive a (n+1)th stage clock signal CK(n+1), and a drainterminal of the third TFT NT3 is electrically connected to a sourceterminal of the eighth TFT NT8. A source terminal and a gate terminal ofthe fourth TFT NT4 receives a (n−1)th stage clock signal CK(n−1), and adrain terminal of the fourth TFT NT4 is electrically connected to asource terminal of the ninth TFT NT9. A gate terminal of the sixth TFTNT6 is electrically connected to the source terminal of the seventh TFTNT7, a source terminal of the sixth TFT NT6 receives the low potentialsignal VGL, and a drain terminal of the sixth TFT NT6 is electricallyconnected to the output terminal of the pull-down control module 103. Agate terminal of the eighth TFT NT8 receives the forward scan signalU2D, and a drain terminal of the eighth TFT NT8 is electricallyconnected to the output terminal of the pull-down control module 103. Agate terminal of the ninth TFT NT9 receives the reverse scan signal D2U,and a drain terminal of the ninth TFT is electrically connected to theoutput terminal of the pull-down control module 103. A gate terminal ofthe twelfth TFT NT12 receives a first global control signal GAS1, asource terminal of the twelfth TFT NT12 receives the low potentialsignal VGL, and a drain terminal of the twelfth TFT NT12 is electricallyconnected to the output terminal of the pull-down control module 103.Wherein, the pull-down control module is configured to generate thesecond control signal, which is the low potential signal, to turn offthe pull-down output module when the power is turned off.

Specifically, when power is turned off, the (n+1)th stage clock signalCK(n+1) is turned into the low potential signal so that the third TFTNT3 is turned off, the forward scan signal U2D is turned into the lowpotential signal so that the eighth TFT NT8 is turned off, the (n−1)thstage clock signal CK(n−1) is turned into low potential signal so thatthe fourth TFT NT4 is turned off, and the reverse scan signal D2U isturned into low potential signal so that the ninth TFT NT9 is turnedoff. Because the gate terminal of the sixth TFT NT6 is electricallyconnected to the drain terminal of the second TFT NT2 and the drainterminal of the second TFT NT2 is at low potential, the sixth TFT NT6 isturned off. Because the gate terminal of the twelfth TFT NT12 receivesthe first global control signal GAS1 and the first global control signalGAS1 is at high potential, the twelfth TFT NT12 is turned on. Becausethe source of the twelfth TFT NT12 receives the low potential signal,the drain terminal of the twelfth TFT NT12 outputs the low potentialsignal to the output terminal of the pull-down control module.

As shown in FIG. 2, the reference numeral 104 indicates the diagramshowing connections of the pull-down output module. The pull-down outputmodule 104 comprises the eleventh TFT NT11.

In the embodiment, a gate terminal of the eleventh TFT NT11 iselectrically connected to the output terminal of the pull-down controlmodule 103, a source terminal of the eleventh TFT NT11 receives the lowpotential signal VGL, and a drain terminal of the eleventh TFT NT11 iselectrically connected to the output terminal G(n) of the nth GOAdriving unit stage. Wherein, the pull-down output module is turned offby the low potential signal generated from the pull-down control modulewhen power is turned off, so that the low potential signal is not outputto the output terminal of the nth GOA driving unit stage from thepull-down output module.

Specifically, when power is turned off, the source terminal of theeleventh TFT NT11 receives the low potential signal and the gateterminal of the eleventh TFT NT11 is electrically connected to theoutput terminal of the pull-down control module 103. Because thepull-down control module 103 outputs the low potential signal, theeleventh TFT NT11 is turned off so that the drain terminal of theeleventh TFT NT11 does not output the low potential signal to the outputterminal G(n) of the nth GOA driving unit stage.

As shown in FIG. 2, the reference numeral 105 indicates the diagramshowing connections of the first global control module. The first globalcontrol module 105 comprises the fourteenth TFT NT14.

In one embodiment, a gate terminal and a source terminal of thefourteenth TFT NT14 receive the first global control signal GAS1, and adrain terminal of the fourteenth TFT NT14 is electrically connected tothe output terminal G(n) of the nth GOA driving unit stage. Wherein, thefirst global control module is configured to output the high potentialsignal to the output terminal of the nth GOA driving unit stage whenpower is turned off.

Specifically, when power is turned off, the first global control signalGAS1 is turned into the high potential signal. Because the gate terminaland the source terminal of the fourteenth TFT NT14 both receives thefirst global control signal GAS1, the fourteenth TFT NT14 is turned onso that the drain terminal of the fourteenth TFT NT14 outputs the highpotential signal to the output terminal G(n) of the nth GOA driving unitstage.

As shown in FIG. 2, the reference numeral 106 indicates the diagramshowing connections of the reset module. The reset module 106 comprisesthe thirteenth TFT NT13.

In one embodiment, a gate terminal and a source terminal of thethirteenth TFT NT13 receives the reset signal Reset, and a drainterminal of the thirteenth TFT NT13 is electrically connected to theoutput terminal of the pull-down control module 103. Wherein, the resetmodule is configured to control to output the low potential signal fromthe output terminal of the pull-down control module.

Specifically, when power is turned off, the reset signal Reset is turnedinto the low potential signal. Because the gate terminal and the sourceterminal of the thirteenth TFT NT13 both receive the reset signal Reset,the thirteenth TFT NT13 is turned off so that the drain terminal of thethirteenth TFT NT13 does not output the high potential signal to theoutput terminal of the pull-down control module 103.

As shown in FIG. 2, the reference numeral 107 indicates the diagramshowing connections of the second global control module. The secondglobal control module 107 comprises the fifteenth TFT NT15.

In the embodiment, a gate terminal of the fifteenth TFT NT15 receives asecond global control signal GAS2, a source terminal of the fifteenthTFT NT15 receives the low potential signal VGL, and a drain terminal ofthe fifteenth TFT NT15 is electrically connected to the output terminalG(n) of the nth GOA driving unit stage. Wherein, the second globalcontrol module controls to output the high potential signal from theoutput terminal of the nth GOA driving unit stage when power is turnedoff.

Specifically, when power is turned off, the second global control signalGAS2 is turned into the low potential signal. Because the gate terminalof the fifteenth TFT T15 receives the second global control signal GAS2and the source terminal of the fifteenth TFT T15 receives the lowpotential signal, the fifteenth TFT T15 is turned off so that the drainterminal of the fifteenth TFT T15 does not output the high potentialsignal to the output terminal G(n) of the nth GOA driving unit stage.

Selectively, the GOA driving unit can further comprise a first capacitorC1 and a second capacitor C2. Wherein, a first terminal of the firstcapacitor C1 is electrically connected to the source terminal of theseventh TFT NT7, and a second terminal of the first capacitor C1receives the low potential signal VGL; and a first terminal of thesecond capacitor C2 is electrically connected to the output terminal ofthe pull-down control module 103, and a second terminal of the secondcapacitor 02 receives the low potential signal VGL. Wherein, when poweris turned off, the first capacitor is configured to keep a potential atthe source terminal of the seventh TFT and the second capacitor isconfigured to keep a potential at the output terminal of the pull-downcontrol module.

It is noted that, as shown in FIG. 2, there are the output signal G(n−2)output from the (n−2)th GOA driving unit stage, the output signal G(n)output from the nth GOA driving unit stage and the output signal G(n+2)output from the (n+2) th GOA driving unit stage in the circuit of theGOA driving unit. It can be understood that the GOA driving circuit canbe formed through the connecting relationships between these stages. Forexample, the gate terminal of the first TFT NT1 of the third drivingunit stage is electrically connected to the output terminal G(1) of thefirst driving unit stage, and the gate terminal of the second TFT NT2 ofthe third driving unit stage is electrically connected to the outputterminal G(5) of the fifth driving unit stage. Furthermore, because thegate terminals of the first TFT's NT1 of the first and second drivingunit stages cannot be connected to the output terminals of a drivingunit stage non-existed, the gate terminals of the first TFT's NT1 of thefirst and second driving unit stages receive a starting signal STV. Inaddition, because the gate terminals of the second TFT's NT2 of the lastand penultimate driving unit stages cannot be connected to the outputterminals of a driving unit stage non-existed, the gate terminals of thesecond TFT's NT2 of the last and penultimate driving unit stages arealso receive the starting signal STV.

As shown in FIG. 3, which is a timing diagram, the first timing showsthe potentials of the input signals of the GOA driving circuit at a timepoint when the liquid crystal screen functions normally, and the secondtiming shows the potentials of the input signals of the GOA drivingcircuit at a time point when power of the liquid crystal screen isturned off. It can be found that, when power is turned off, the startingsignal STV and the first global control signal GAS1 are changed to be athigh potential and the forward scan signal U2D, the reverse scan signalD2U, the clock signal CK, the second global control signal GAS2 and thereset signal Reset are changed to be at low potential, so that each GOAdriving unit stage of the GOA driving circuit is controlled to outputthe high potential signal to achieve all gate on function.

It can be found that each GOA driving unit stage of the GOA drivingcircuit in the embodiments of the present disclosure comprises a pull-upcontrol module, a pull-down control module, a pull-up output module, apull-down output module, a first global control module, a second globalcontrol module and a reset module. When power is turned off, the pull-upcontrol module generates the low potential signal to turn off thepull-up output module so that the output of the pull-up output moduledoes not affect the output terminal of the GOA driving unit; thepull-down control module and the reset module generate the low potentialsignal to turn off the pull-down output module so that the output of thepull-down output module does not affect the output terminal of the GOAdriving unit; the first global control module and the second globalcontrol module controls to output the high potential signal. Byperforming the embodiments of the present disclosure, image on theliquid crystal screen can be quickly cleaned when power of the liquidcrystal screen is suddenly turned-off, residual image is prevented frombeing remained on the screen, and visual experience is benefittherefrom.

In the foregoing embodiments, the description of each embodiment has itsown emphasis. For the parts that are not described in detail in oneembodiment, reference may be made to related descriptions in otherembodiments.

Specific examples are used herein to describe the principle andimplementation solutions of the present disclosure. The description ofthe foregoing embodiments is merely used to help understand the methodand core idea of the present disclosure. Meanwhile, for those skilled inthe art, according to the present invention, the specific implementationsolutions and the scope of application can be changed. In summary, thecontent of the disclosure should not be construed as a limitation on thepresent invention.

What is claimed is:
 1. A gate driver on array (GOA) driving circuit,wherein the GOA driving circuit comprises a plurality of GOA drivingunit stages; wherein, a nth GOA driving unit stage comprises: a pull-upcontrol module, a pull-up output module, a pull-down control module, apull-down output module, a first global control module, a reset moduleand a second global control module; the pull-up control module isconfigured to generate a first control signal when power is turned off;the pull-up output module is configured to stop outputting a clocksignal to an output terminal of the nth GOA driving unit stage undercontrol of the first control signal; the pull-down control module isconfigured to generate a second control signal when power is turned off;the pull-down output module is configured to stop outputting a lowpotential signal to the output terminal of the nth GOA driving unitstage under control of the second control signal; the first globalcontrol module is configured to output a high potential signal to theoutput terminal of the nth GOA driving unit stage when power is turnedoff; the reset module is configured to stop outputting a reset signal toan output terminal of the pull-down control module when power is turnedoff; the second global control module is configured to stop outputtingthe low potential signal to the output terminal of the nth GOA drivingunit stage when power is turned off.
 2. The GOA driving circuitaccording to claim 1, wherein the pull-up control module comprises afirst thin film transistor (TFT), a second TFT, a fifth TFT and aseventh TFT; wherein, a gate terminal of the first TFT receives anoutput signal of a (n−2)th GOA driving unit stage, a source terminal ofthe first TFT receives a forward scan signal, and a drain terminal ofthe first TFT is electrically connected to a source terminal of theseventh TFT; a gate terminal of the second TFT receives an output signalof a (n+2)th GOA driving unit stage, a source terminal of the second TFTreceives a reverse scan signal, and a drain terminal of the second TFTis electrically connected to the source terminal of the seventh TFT; agate terminal of the fifth TFT is electrically connected to the outputterminal of the pull-down control module, a source terminal of the fifthTFT receives the low potential signal, and a drain terminal of the fifthTFT is electrically connected to the source terminal of the seventh TFT;a gate terminal of the seventh TFT receives the high potential signal,and a drain terminal of the seventh TFT is electrically connected to anoutput terminal of the pull-up control module; wherein, the pull-upcontrol module is configured to generate the first control signal, whichis the low potential signal, to turn off the pull-up output module whenthe power is turned off.
 3. The GOA driving circuit according to claim2, wherein the pull-up output module comprises: a tenth TFT; wherein, agate of the tenth TFT is electrically connected to the output terminalof the pull-up control module, a source terminal of the tenth TFTreceives a nth stage clock signal, and a drain terminal of the tenth TFTis electrically connected to the output terminal of the nth GOA drivingunit stage; wherein, the pull-up output module is turned off by the lowpotential signal generated from the pull-up control module when power isturned off, so that the low potential signal is not output to the outputterminal of the nth GOA driving unit stage from the pull-up outputmodule.
 4. The GOA driving circuit according to claim 3, wherein thepull-down control module comprises: a third TFT, a fourth TFT, a sixthTFT, an eighth TFT, a ninth TFT and a twelfth TFT; wherein, a gateterminal and a source terminal of the third TFT receive a (n+1)th stageclock signal, and a drain terminal of the third TFT is electricallyconnected to a source terminal of the eighth TFT; a source terminal anda gate terminal of the fourth TFT receives a (n−1)th stage clock signal,and a drain terminal of the fourth TFT is electrically connected to asource terminal of the ninth TFT; a gate terminal of the sixth TFT iselectrically connected to the source terminal of the seventh TFT, asource terminal of the sixth TFT receives the low potential signal, anda drain terminal of the sixth TFT is electrically connected to theoutput terminal of the pull-down control module; a gate terminal of theeighth TFT receives the forward scan signal, and a drain terminal of theeighth TFT is electrically connected to the output terminal of thepull-down control module; a gate terminal of the ninth TFT receives thereverse scan signal, and a drain terminal of the ninth TFT iselectrically connected to the output terminal of the pull-down controlmodule; a gate terminal of the twelfth TFT receives a first globalcontrol signal, a source terminal of the twelfth TFT receives the lowpotential signal, and a drain terminal of the twelfth TFT iselectrically connected to the output terminal of the pull-down controlmodule; wherein, the pull-down control module is configured to generatethe second control signal, which is the low potential signal, to turnoff the pull-down output module when the power is turned off.
 5. The GOAdriving circuit according to claim 4, wherein the pull-down outputmodule comprises; an eleventh TFT; wherein, a gate terminal of theeleventh TFT is electrically connected to the output terminal of thepull-down control module, a source terminal of the eleventh TFT receivesthe low potential signal, and a drain terminal of the eleventh TFT iselectrically connected to the output terminal of the nth GOA drivingunit stage; wherein, the pull-down output module is turned off by thelow potential signal generated from the pull-down control module whenpower is turned off, so that the low potential signal is not output tothe output terminal of the nth GOA driving unit stage from the pull-downoutput module.
 6. The GOA driving circuit according to claim 5, whereinthe first global control module comprises: a fourteenth TFT; wherein, agate terminal and a source terminal of the fourteenth TFT receive thefirst global control signal, and a drain terminal of the fourteenth TFTis electrically connected to the output terminal of the nth GOA drivingunit stage; wherein, the first global control module outputs the highpotential signal to the output terminal of the nth GOA driving unitstage when power is turned off.
 7. The GOA driving circuit according toclaim 6, wherein the reset module comprises: a thirteenth TFT; wherein,a gate terminal and a source terminal of the thirteenth TFT receives thereset signal, and a drain terminal of the thirteenth TFT is electricallyconnected to the output terminal of the pull-down control module;wherein, the reset module is configured to control to output the lowpotential signal from the output terminal of the pull-down controlmodule.
 8. The GOA driving circuit according to claim 7, wherein thesecond global control module comprises: a fifteenth TFT; wherein, a gateterminal of the fifteenth TFT receives a second global control signal, asource terminal of the fifteenth TFT receives the low potential signal,and a drain terminal of the fifteenth TFT is electrically connected tothe output terminal of the nth GOA driving unit stage; wherein, thesecond global control module controls to output the high potentialsignal from the output terminal of the nth GOA driving unit stage whenpower is turned off.
 9. The GOA driving circuit according to claim 8,wherein the nth GOA driving unit stage further comprises a firstcapacitor and a second capacitor; wherein, a first terminal of the firstcapacitor is electrically connected to the source terminal of theseventh TFT, and a second terminal of the first capacitor receives thelow potential signal; a first terminal of the second capacitor iselectrically connected to the output terminal of the pull-down controlmodule, and a second terminal of the second capacitor receives the lowpotential signal; wherein, when power is turned off, the first capacitoris configured to keep a potential at the source terminal of the seventhTFT and the second capacitor is configured to keep a potential at theoutput terminal of the pull-down control module.
 10. The GOA drivingcircuit according to claim 8, wherein, in a first GOA driving unit stageand a second GOA driving unit, the gate terminal of the first TFTreceives a starting signal; and, in a last GOA driving unit stage and apenultimate GOA driving unit stage, the gate terminal of the second TFTreceives the starting signal; wherein the starting signal is the highpotential signal.